博迪《投资学》第十版·英文版（全套讲义+课后习题答案）
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博迪投资学课后答案
博迪《投资学》第
课后习题答案
博迪投资学第
博迪投资学课后习题答案
博迪投资学第10版讲义
课后习题答案英文版
博迪《投资学》
博迪《投资学》第10版
《投资学》第10版
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Chapter 12 - Behavioral Finance and Technical AnalysisCHAPTER 12: BEHAVIORAL FINANCEAND TECHNICAL ANALYSISPROBLEM SETS 1.Technical analysis can generally be viewed as a search for trends or patterns in market prices. Technical analysts tend to view these trends as momentum, or gradual adjustments to correct prices, or, alternatively, reversals of trends. A number of the behavioral biases discussed in the chapter might contribute to such trends and patterns. For example, a conservatism bias might contribute to a trend in prices as investors gradually take new information into account, resulting in gradual adjustment of prices towards their fundamental values. Another example derives from the concept of representativeness, which leads investors to inappropriately conclude, on the basis of a small sample of data, that a pattern has been established that will continue well into the future. When investors subsequently become aware of the fact that prices have overreacted, corrections reverse the initial erroneous trend.2.Even if many investors exhibit behavioral biases, security prices might still be set efficiently if the actions of arbitrageurs move prices to their intrinsic values. Arbitrageurs who observe mispricing in the securities markets would buy underpriced securities (or possibly sell short overpriced securities) in order to profit from the anticipated subsequent changes as prices move to their intrinsic values. Consequently, securities prices would still exhibit the characteristics of an efficient market.3.One of the major factors limiting the ability of rational investors to take advantage of any pricing errors that result from the actions of behavioral investors is the fact that a mispricing can get worse over time. An example of this fundamental risk is the apparent ongoing overpricing of the NASDAQ index in the late 1990s. Related factors are the inherent costs and limits related to short selling, which restrict the extent to which arbitrage can force overpriced securities (or indexes) to move towards their fair values. Rational investors must also be aware of the risk that an apparent mispricing is, in fact, a consequence of model risk; that is, the perceived mispricing may not be real because the investor has used a faulty model to value the security.4.There are two reasons why behavioral biases might not affect equilibrium asset prices: first, behavioral biases might contribute to the success of technical trading rules as prices gradually adjust towards their intrinsic values, and second, the actions of arbitrageurs might move security prices towards their intrinsic values. It might be important for investors to be aware of these biases because either of these scenarios might create the potential for excess profits even if behavioral biases do not affect equilibrium prices.In addition, an investor should be aware of his personal behavioral biases, even if those biases do not affect equilibrium prices, to help avoid some of these information processing errors (e.g. overconfidence or representativeness). 5.Efficient market advocates believe that publicly available information (and, for advocates of strong-form efficiency, even insider information) is, at any point in time, reflected in securities prices, and that price adjustments to new information occur very quickly. Consequently, prices are at fair levels so that active management is very unlikely to improve performance above that of a broadly diversified index portfolio. In contrast, advocates of behavioral finance identify a number of investor errors in information processing and decision making that could result in mispricing of securities. However, the behavioral finance literature generally does not provide guidance as to how these investor errors can be exploited to generate excess profits. Therefore, in the absence of any profitable alternatives, even if securities markets are not efficient, the optimal strategy might still be a passive indexing strategy.6.a. Davis uses loss aversion as the basis for her decision making. She holds on to stocks that are down from the purchase price in the hopes that they will recover. She is reluctant to accept a loss.7.a. Shrum refuses to follow a stock after she sells it because she does not want to experience the regret of seeing it rise. The behavioral characteristic used for the basis for her decision making is the fear of regret. 8.a. Investors attempt to avoid regret by holding on to losers hoping the stocks will rebound. If the stock rebounds to its original purchase price, the stock can be sold with no regret. Investors also may try to avoid regret by distancing themselves from their decisions by hiring a full-service broker.9.a. ivb. iiic. vd. ie. ii10.Underlying risks still exist even during a mispricing event. The market mispricing could get worse before it gets better. Other adverse effects could occur before the price corrects itself (e.g., loss of clients with no understanding or appetite for mispricing opportunities). 11. Data mining is the process by which patterns are pulled from data. Technical analysts must be careful not to engage in data mining as great is the human capacity to discern patterns where no patterns exist. Technical analysts must avoid mining data to support a theory rather than using data to test a theory. 12. Even if prices follow a random walk, the existence of irrational investors combined with the limits to arbitrage by arbitrageurs may allow persistent mispricings to be present. This implies that capital will not be allocated efficientlycapital does not immediately flow from relatively unproductive firms to relatively productive firms.13.Trin =$1,058,313/1,553$852,581/1,455=1.16This trin ratio, which is above 1.0, would be taken as a bearish signal.14.Breadth:AdvancesDeclinesNet Advances1,4551,553-98Breadth is negativebearish signal (no one would actually use a one-day measure).15.This exercise is left to the student; answers will vary, but successful students should be able to identify time periods when upward or downward trends are obvious. This exercise also shows the benefit of hindsight, which investors do not possess when making current decisions. 16.The confidence index increases from (5%/6%) = 0.833 to (6%/7%) = 0.857.This indicates slightly higher confidence which would be interpreted by technicians as a bullish signal. But the real reason for the increase in the index is the expectation of higher inflation, not higher confidence about the economy.17.At the beginning of the period, the price of Computers, Inc. divided by the industry index was 0.39; by the end of the period, the ratio had increased to 0.50. As the ratio increased over the period, it appears that Computers, Inc. outperformed other firms in its industry. The overall trend, therefore, indicates relative strength, although some fluctuation existed during the period, with the ratio falling to a low point of 0.33 on day 19.18.Five day moving averages:Days 1 5: (19.63 + 20 + 20.5 + 22 + 21.13) / 5 = 20.65Days 2 6 = 21.13Days 3 7 = 21.50Days 4 8 = 21.90Days 5 9 = 22.13Days 6 10 = 22.68Days 7 11 = 23.18Days 8 12 = 23.45Sell signal (day 12 price moving average)Days 18 22 = 19.28Days 19 23 = 19.93Days 20 24 = 21.05Days 21 25 = 22.05Days 22 26 = 23.18Days 23 27 = 24.13Days 24 28 = 25.13Days 25 29 = 26.00Days 26 30 = 26.80Days 27 31 = 27.45Days 28 32 = 27.80Days 29 33 = 27.90Sell signal (day 33 price moving average)Days 30 34 = 28.20Days 31 35 = 28.45Days 32 36 = 28.65Days 33 37 = 29.05Days 34 38 = 29.25Days 35 39 = 29.00Days 36 40 = 28.7519.This pattern shows a lack of breadth. Even though the index is up, more stocks declined than advanced, which indicates a “lack of broad-based support” for the rise in the index.20.DayAdvancesDeclinesNet AdvancesCumulative Breadth19067042022022653986-333-1313721789- 68-1994503968-465-66454971,095-598-1,2626970702268-99471,002609393-6018903722181-4209850748102-318107667660-318The signal is bearish as cumulative breadth is negative; however, the negative number is declining in magnitude, indicative of improvement. Perhaps the worst of the bear market has passed.21.Trin = This is a slightly bullish indicator, with average volume in advancing issues a bit greater than average volume in declining issues.22.Confidence Index = This year: Confidence index = (8%/10.5%) = 0.762Last year: Confidence index = (8.5%/10%) = 0.850Thus, the confidence index is decreasing.23.Note: In order to create the 26-week moving average for the S&P 500, we converted the weekly returns to weekly index values, with a base of 100 for the week prior to the first week of the data set. The following graph shows the S&P 500 values and the 26-week moving average, beginning with the 26th week of the data set.a.The graph summarizes the data for the 26-week moving average. The graph also shows the values of the S&P 500 index.b.The S&P 500 crosses through its moving average from below 14 times, as indicated in the table below. The index increases seven times in weeks following a cross-through and decreases seven times.Date ofCross-ThroughDirection of S&P 500 in Subsequent Week05/18/01Decrease06/08/01Decrease12/07/01Decrease12/21/01Increase03/01/02Increase11/22/02Increase01/03/03Increase03/21/03Decrease04/17/03Increase06/10/04Decrease09/03/04Increase10/01/04Decrease10/29/04Increase04/08/05Decreasec.The S&P 500 crosses through its moving average from above 14 times, as indicated in the table below. The index increases nine times in weeks following a cross-through and decreases five times.Date of Cross-ThroughDirection of S&P 500 in Subsequent WeekDate of Cross-ThroughDirection of S&P 500 in Subsequent Week06/01/01Increase03/28/03Increase06/15/01Increase04/30/04Decrease12/14/01Increase07/02/04Decrease02/08/02Increase09/24/04Increase04/05/02Decrease10/15/04Decrease12/13/02Increase03/24/05Increase01/24/03Decrease04/15/05Increased. When the index crosses through its moving average from below, as in part (b), this is regarded as a bullish signal. In our sample, the index is as likely to increase as it is to decrease following such a signal. When the index crosses through its moving average from above, as in part (c), this is regarded as a bearish signal. In our sample, contrary to the bearish signal, the index is actually more likely to increase than it is to decrease following such a signal. 24.In order to create the relative strength measure, we converted the weekly returns for the Fidelity Banking Fund and for the S&P 500 to weekly index values, using a base of 100 for the week prior to the first week of the data set. The first graph shows the resulting values, along with the relative strength measure ( 100). The second graph shows the percentage change in the relative strength measure over five-week intervals.a.The following graph summarizes the relative strength data for the fund.b.Over five-week intervals, relative strength increased by more than 5% 29 times, as indicated in the table and graph below. The Fidelity Banking Fund underperformed the S&P 500 index 18 times and outperformed the S&P 500 index 11 times in weeks following an increase of more than 5%.Date of IncreasePerformance of Banking Fund in Subsequent WeekDate of IncreasePerformance of Banking Fund in Subsequent Week07/21/00Outperformed03/09/01Outperformed08/04/00Outperformed03/16/01Underperformed08/11/00Underperformed03/30/01Underperformed08/18/00Outperformed06/22/01Underperformed09/22/00Outperformed08/17/01Underperformed09/29/00Underperformed03/15/02Outperformed10/06/00Underperformed03/22/02Underperformed12/01/00Underperformed03/28/02Outperformed12/22/00Underperformed04/05/02Outperformed12/29/00Outperformed04/12/02Underperformed01/05/01Underperformed04/26/02Outperformed01/12/01Underperformed05/03/02Underperformed02/16/01Underperformed05/10/02Underperformed02/23/01Outperformed06/28/02Underperformed03/02/01Underperformedc.Over five-week intervals, relative strength decreases by more than 5% 15 times, as indicated in the graph above and table below. The Fidelity Banking Fund underperformed the S&P 500 index six times and outperformed the S&P 500 index nine times in weeks following a decrease of more than 5%.Date of DecreasePerformance of Banking Fund in Subsequent WeekDate of DecreasePerformance of Banking Fund in Subsequent Week07/07/00Underperformed04/16/04Underperformed07/14/00Outperformed04/23/04Outperformed05/04/01Underperformed12/03/04Outperformed05/11/01Outperformed12/10/04Underperformed10/12/01Outperformed12/17/04Outperformed11/02/01Outperformed12/23/04Underperformed10/04/02Outperformed12/31/04Underperformed10/11/02Outperformedd.An increase in relative strength, as in part (b) above, is regarded as a bullish signal. However, in our sample, the Fidelity Banking Fund is more likely to underperform the S&P 500 index than it is to outperform the index following such a signal. A decrease in relative strength, as in part (c), is regarded as a bearish signal. In our sample, contrary to the bearish signal, the Fidelity Banking Fund is actually more likely to outperform the index increase than it is to underperform following such a signal.25.It has been shown that discrepancies of price from net asset value in closed-end funds tend to be higher in funds that are more difficult to arbitrage such as less-diversified funds. CFA PROBLEMS 1.i.Mental accounting is best illustrated by Statement #3. Sampsons requirement that his income needs be met via interest income and stock dividends is an example of mental accounting. Mental accounting holds that investors segregate funds into mental accounts (e.g., dividends and capital gains), maintain a set of separate mental accounts, and do not combine outcomes; a loss in one account is treated separately from a loss in another account. Mental accounting leads to an investor preference for dividends over capital gains and to an inability or failure to consider total return.ii.Overconfidence (illusion of control) is best illustrated by Statement #6. Sampsons desire to select investments that are inconsistent with his overall strategy indicates overconfidence. Overconfident individuals often exhibit risk-seeking behavior. People are also more confident in the validity of their conclusions than is justified by their success rate. Causes of overconfidence include the illusion of control, self-enhancement tendencies, insensitivity to predictive accuracy, and misconceptions of chance processes.iii.Reference dependence is best illustrated by Statement #5. Sampsons desire to retain poor-performing investments and to take quick profits on successful investments suggests reference dependence. Reference dependence holds that investment decisions are critically dependent on the decision-makers reference point. In this case, the reference point is the original purchase price. Alternatives are evaluated not in terms of final outcomes but rather in terms of gains and losses relative to this reference point. Thus, preferences are susceptible to manipulation simply by changing the reference point.2.a.Frosts statement is an example of reference dependence. His inclination to sell the international investments once prices return to the original cost depends not only on the terminal wealth value, but also on where he is now, that is, his reference point. This reference point, which is below the original cost, has become a critical factor in Frosts decision.In standard finance, alternatives are evaluated in terms of terminal wealth values or final outcomes, not in terms of gains and losses relative to some reference point such as original cost.b.Frosts statement is an example of susceptibility to cognitive error, in at least two ways. First, he is displaying the behavioral flaw of overconfidence. He likely is more confident about the validity of his conclusion than is justified by his rate of success. He is very confident that the past performance of Country XYZ indicates future performance. Behavioral investors could, and often do, conclude that a five-year record is ample evidence to suggest future performance. Second, by choosing to invest in the securities of only Country XYZ, Frost is also exemplifying the behavioral finance phenomenon of asset segregation. That is, he is evaluating Country XYZ investment in terms of its anticipated gains or losses viewed in isolation.Individuals are typically more confident about the validity of their conclusions than is justified by their success rate or by the principles of standard finance, especially with regard to relevant time horizons. In standard finance, investors know that five years of returns on Country XYZ securities relative to all other markets provide little information about future performance. A standard finance investor would not be fooled by this “law of small numbers.” In standard finance, investors evaluate performance in portfolio terms, in this case defined by combining the Country XYZ holding with all other securities held. Investments in Country XYZ, like all other potential investments, should be evaluated in terms of the anticipated contribution to the riskreward profile of the entire portfolio.c.Frosts statement is an example of mental accounting. Mental accounting holds that investors segregate money into mental accounts (e.g., safe versus speculative), maintain a set of separate mental accounts, and do not combine outcomes; a loss in one account is treated separately from a loss in another account. One manifestation of mental accounting, in which Frost is engaging, is building a portfolio as a pyramid of assets, layer by layer, with the retirement account representing a layer separate from the speculative fund. Each layer is associated with different goals and attitudes toward risk. He is more risk averse with respect to the retirement account than he is with respect to the speculative fund account. The money in the retirement account is a downside protection layer, designed to avoid future poverty. The money in the speculative fund account is the upside potential layer, designed for a chance at being rich.In standard finance, decisions consider the risk and return profile of the entire portfolio rather than anticipated gains or losses on any particular account, investment, or class of investments. Alternatives should be considered in terms of final outcomes in a total portfolio context rather than in terms of contributions to a safe or a speculative account. Standard finance investors seek to maximize the mean-variance structure of the portfolio as a whole and consider covariances between assets as they construct their portfolios. Standard finance investors have consistent attitudes toward risk across their entire portfolio.3.a.Illusion of knowledge: Maclin believes he is an expert on, and can make accurate forecasts about, the real estate market solely because he has studied housing market data on the Internet. He may have access to a large amount of real estate-related information, but he may not understand how to analyze the information nor have the ability to apply it to a proposed investment.Overconfidence: Overconfidence causes us to misinterpret the accuracy of our information and our skill in analyzing it. Maclin has assumed that the information he collected on the Internet is accurate without attempting to verify it or consult other sources. He also assumes he has skill in evaluating and analyzing the real estate-related information he has collected, although there is no information in the question that suggests he possesses such ability.b.Reference point: Maclins reference point for his bond position is the purchase price, as evidenced by the fact that he will not sell a position for less than he paid for it. This fixation on a reference point, and the subsequent waiting for the price of the security to move above that reference point before selling the security, prevents Maclin from undertaking a risk/return-based analysis of his portfolio position.c.Familiarity: Maclin is evaluating his holding of company stock based on his familiarity with the company rather than on sound investment and portfolio principles. Company employees, because of this familiarity, may have a distorted perception of their own company, assuming a “good company” will also be a good investment. Irrational investors believe an investment in a company with which they are familiar will produce higher returns and have less risk than nonfamiliar investments.Representativeness: Maclin is confusing his company (which may well be a good company) with the companys stock (which may or may not be an appropriate holding for his portfolio and/or a good investment) and its future performance. This can result in employees overweighting their company stock, thereby holding an underdiversified portfolio.4.a.The behavioral finance principle of biased expectations/overconfidence is most consistent with the investors first statement. Petrie stock provides a level of confidence and comfort for the investor because of the circumstances in which she acquired the stock and her recent history with the returns and income from the stock. However, the investor exhibits overconfidence in the stock given the needs of her portfolio (she is retired) and the brevity of the recent performance history.b.The behavioral finance principle of mental accounting is most consistent with the investors second statement. The investor has segregated the monies distributed from her portfolio into two “accounts”: the returns her portfolio receives on the Petrie stock and the returns on the rest of her portfolio. She is maintaining a separate set of mental accounts with regard to the total funds distributed. The investors specific uses should be viewed in the overall context of her spending needs and she should consider the risk and return profile of the entire portfolio.5.i.Overconfidence (Biased Expectations and Illusion of Control): Pierce is basing her investment strategy for supporting her parents on her confidence in the economic forecasts. This is a cognitive error reflecting overconfidence in the form of both biased expectations and an illusion of control. Pierce is likely more confident in the validity of those forecasts than is justified by the accuracy of prior forecasts. Analysts consensus forecasts have proven routinely and widely inaccurate. Pierce also appears to be overly confident that the recent performance of the Pogo Island economy is a good indicator of future performance. Behavioral investors often conclude that a short track record is ample evidence to suggest future performance.Standard finance investors understand that individuals typically have greater confidence in the validity of their conc
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